"Art of the Story Festival", Washington County Libraries, Saturday, April 1 through Sunday, April 8. Complete list here: https://www.wccls.org/art-story-13th-annual-storytelling-festival
"Open Garden Days", Saturdays and Sundays in April and May, 11AM-4PM, Cecil and Molly Smith Rhododendron Garden, 5055 Ray Bell Rd. NE, St. Paul. (near Champoeg State Park). $3 admission. This garden is absolutely stunning in the springtime and is not to be missed! http://smithgarden.org/smithgarden.org/Welcome.html
"Hike in the Mist Zone", Thursdays in April, 2PM, Silver Falls State Park, South Falls Lodge Porch. "Join Friends of Silver Falls guide Earl McCollum in this 2.5 mile, 2-hour hike exploring the natural beauty and plant life of the Silver Creek Canyon."http://oregonstateparks.org/index.cfm?do=parkPage.dsp_parkPage&parkId=151
"The Astronomical Evidence for Dark Matter", Thursday, April 6, 7PM, Mission Theater, 1624 NW Glisan St., Pdx. $5 suggested donation. Presented by Alison Crocker, D. Phil, Assistant Professor in the Department of Physics at Reed College. "On the Universal stage, dark matter runs the show. It’s over four times more abundant than the familiar normal matter and is necessary for forming galaxies, like our own Milky Way, but we can’t see it or feel it and don’t know exactly what it is! So how are we so sure it exists? In this talk, astrophysicist Alison Crocker will highlight the most convincing observations astronomers have made of dark matter. From the rotation of galaxies, to the motion of galaxies within clusters, to the bending of light through gravitational warping of space, many different observational data require dark matter for a good explanation. She will also explain how astronomical observations constrain some of the properties of dark matter - namely that it must move much slower than the speed of light and be very weakly interacting with normal matter and electromagnetic radiation."
"Designing Robots to Walk and Run", Tuesday, April 18, 7PM, OMSI Empirical Theater. $5 suggested donation. Presented by Jonathan Hurst, PhD, Associate Professor of Mechanical Engineering at Oregon State University. "Legged locomotion is a challenging physical interaction task: underactuation, unexpected impacts, and large and rapidly changing forces and velocities are commonplace. Designing passive dynamics, which are generated by the mechanical hardware, and software control algorithms together in tight integration can drastically improve the performance of a machine as measured by efficiency, agility, and robustness to disturbances. This design philosophy was recently demonstrated on ATRIAS, a bipedal spring-mass robot. The passive dynamics of the hardware match a simple biomechanically-derived spring-mass model, while the software control relies on these passive dynamics as an integrated aspect of the system behavior. ATRIAS walks using approximately 400W of power, accelerates to a run, handles large unexpected obstacles with no prior knowledge of the terrain, and is the first machine to reproduce the dynamics of a human walking gait. In this presentation, we explain our design philosophy, results with ATRIAS, current work on a successor robot Cassie, and plans for commercialization of this technology by Agility Robotics." https://www.omsi.edu/calendar/science-pub-portland-designing-robots
“Wild Chickens of the Pacific Northwest”, Wednesday, April 19, 7PM, Audubon Society of Portland, 5151 NW Cornell Rd., Pdx. $14 for class only or $85 with additional field trip April 22. Preregistration required; register online: http://audubonportland.org/trips-classes-camps/adult/classes/wildChickens “Among the most obscure and sought-after birds anywhere, there are several species of grouse, partridge and quail occurring in the Pacific Northwest. Some of them are pretty difficult to see, but others can relatively easily be observed in the wild if you do your research. Birding expert Stefan Schlick will give you an overview of all these species, what is special about each one and how/where to find them in the wild. On the field trip into the Oregon Coast Range we will look for Sooty Grouse.”